Transfer material such as carbon paper



Patented Dec. 8, 1936 TRANSFER MATERIAL soon AS cannon mesa Rogerliraunst'ein.

Socit Anonyme Paris, France, des Anciens Etablissem'ents assignor toBrannstein Freres, Paris, France No Drawing. Application May 4, 1933,Serial No.

669,455. Renewed January 8, 1936.

May 26, 1932 I Claims.

The present invention relates to materials such as carbon papers inwhich the ink is coated upon a carrier sheet. The ings used to this endusually 5 contain fat substances which are intended to embed the.pigments or to dissolve the dyes to be transferred from the carrier to apaper sheet, due tothe pressure exerted by the types of a type-, writeror by a pencil. The present process consists in impregnating the carriersheet with a fat material before it is coated with ink. For instance afat material is added to the paper pulp (or like material), intended forcarrier making. The penetration of the ink is thus facilitated so I thatthe transfer material obtained is homogeneous and doesnot tend to roll.In fact, the ink fully penetrates to the whole depth of the sheet, whilein the usual papers the ink experiences some difficulties in penetratingto the full depth and the inked surface does not possessthe 29. samehygroscopic features and the same shrinkage in cooling as the surfacefree from ink. Furthermore, the ink coating is not loosened when struckby the types of a typewriter.

The process of beating or refining the paper pulp is advantageouslyextended over a longer interval of time, such as would produce atransparent parchment paper, but due to the presence of fat materialsproperly introduced in the pulp. the paper is on the contrary opaque. aThe beating or refining process conveniently carried on enablesobtaining a paper free from holes. The inkpenetrates to the full depthof the paper sheet and uniformly "impregnates the same. Hie followingimportant advantages result:

The back or the surface of the sheet not coated with ink is strongly andregularly dyed. The.

absence of holes results in absence ofstains caused by ink passingthrough the paper sheet. Thus theselling value of the product will beincreased without it being necessary to store it for a long time inorder to allow for the penetration of the ink.

The coated paper acts'perfectly when cooling groscopic variations.

As fat materials there, can be used substances approaching those whichconstitute the inks, so that the coating will cause thesolution of theinks in the fat materials added to-the paper.

the: coating and further is not subjected to hy- In France The latterincreases the opacity of the paper as well as its weight. When neededlime salts may also be .added.

By-way of an example sodium stearate and oxalic acid are added to apaper pulp while in the hollander, and then the said pulp is used toprovide a paper weighing -10 to 25 grams per square meter. The saidpaper'contains .2 to 5 per cent by weight of stearine. Finally the saidpaper constituting the carrier is impregnated with ink by coatingaccording to the usual methods.

Having now particularly described and ascertained the nature of myinvention and in what manner the same is to be performed, I declare thatwhat I claim is:

1. A process of manufacturing a transfer pa per comprislng introducing astearine producing body into the paper'pulp, then manufacturing saidpulp into paper and then coating said paper with acopying ink.

2. A process for manufacturing a transfer paper comprising adding asoluble stearate to the paper pulp, then adding an acid for reactingwith said stearate to said pulp. then manufacturing paper from said pulpand then coating said 'paper with a copying ink.

3. A process for manufacturing transfer paper comprising adding to thepaper pulp sodium stearate, then adding oxalic acid'to said pulp, thenmanufacturing paper from said pulp and then coating said paper with acopying'ink.

4. A transfer paper comprising stearine and having a coating of 9.copying ink.

5. A process for manufacturing transfer paper comprising introducing astearine producing body into a well beaten paper pulmthen manufacturingsaid pulp into paper-and then coating said paper witha copying ink.

